Below is a partial Excel output based on a sample of 25 observations. Coefficients Standard Error Intercept 145.321 48.682 X1 25.625 9.150 X2 *-5.720 3.575 X3 0.823 0.183 Refer to Exhibit 15-5. Carry out the test of significance for the parameter , at the 5% level. The null hypothesis should not be rejected be rejected, O be retested be revised 6:13 PM Type here to search O W 5/6/2021